Which relativistic effect describes the lengthening of the time interval between two events when measured by an observer moving at a significant fraction of the speed of light relative to the events?

💡 Solution & Explanation

Time dilation is a consequence of special relativity where clocks moving at relativistic speeds tick more slowly relative to stationary reference frames. Length contraction reduces physical object dimensions along the direction of motion at high speeds. Mass-energy equivalence establishes that rest mass and energy are interchangeable via the square of the speed of light. Gravitational redshift stretches photon wavelengths escaping intense gravitational potential wells.